Ryan Schnacke
Supporting Actor
- Joined
- Feb 5, 2001
- Messages
- 876
Alright, I've finally downloaded this beauty from Adire's website. And I know that some of you have become very adept at using it. So I thought I'd ask about a few things I'm having trouble with, mostly stuff thats just not explained very well.
"Watts into 8 ohms" (Measurement Setup) - What about a plate amp that's rated at 4 ohms. Should I divide this rated power by 2 and use that for my 8 ohm number? What if I'm using a seperate amplified channel for each voice coil (100Wx2 @ 8 ohms)? I should list the total power (200W) and select "separate sources" in the driver configuration window, right?
"Qa" and "Fill %" (Box window) - The manual seems to indicate that Qa is determined exclusively by Fill %, yet you can specify them independantly. And they each have an effect on the curves. What gives?
"Optimization" (Box window) - I thought I'd start by trying to emulate the Rava design and verify that my results matched the Adire numbers. I put a Shiva in a sealed box and used the "Optimize by table look-up" to get a Q=0.707 box of 64L. Now Adire says the Rava is Q=0.67 in 60L. How'd they manage that? I tried cranking up my fill % but that didn't seem to affect the optimization routine. Have I missed something?
"Q" - Speaking of alignments, is there a window that or menu option that will calculate the total Q for a design once I'm done tweaking and adjusting?
"Port air speed" - My second experiment was to try to emulate the Dharman. I put a Shiva in a bass reflex box with 2 ports - minimum diameter 3" and maximum diameter 4.5" to 5". I was guessing on the max diameter number. 109L and tuned to 22Hz. I don't remember the precise port length I was getting but it was around 30 - 35cm (darn those metric units). With 140 watts @ 8 ohms (????) and voice coils in parallel I was getting port speeds over the 15m/s maximum that they recommend. Is that right?
Sorry so long. But this is interesting stuff and I'd like to learn more about it.
[Edited last by Ryan Schnacke on October 30, 2001 at 02:14 PM]
"Watts into 8 ohms" (Measurement Setup) - What about a plate amp that's rated at 4 ohms. Should I divide this rated power by 2 and use that for my 8 ohm number? What if I'm using a seperate amplified channel for each voice coil (100Wx2 @ 8 ohms)? I should list the total power (200W) and select "separate sources" in the driver configuration window, right?
"Qa" and "Fill %" (Box window) - The manual seems to indicate that Qa is determined exclusively by Fill %, yet you can specify them independantly. And they each have an effect on the curves. What gives?
"Optimization" (Box window) - I thought I'd start by trying to emulate the Rava design and verify that my results matched the Adire numbers. I put a Shiva in a sealed box and used the "Optimize by table look-up" to get a Q=0.707 box of 64L. Now Adire says the Rava is Q=0.67 in 60L. How'd they manage that? I tried cranking up my fill % but that didn't seem to affect the optimization routine. Have I missed something?
"Q" - Speaking of alignments, is there a window that or menu option that will calculate the total Q for a design once I'm done tweaking and adjusting?
"Port air speed" - My second experiment was to try to emulate the Dharman. I put a Shiva in a bass reflex box with 2 ports - minimum diameter 3" and maximum diameter 4.5" to 5". I was guessing on the max diameter number. 109L and tuned to 22Hz. I don't remember the precise port length I was getting but it was around 30 - 35cm (darn those metric units). With 140 watts @ 8 ohms (????) and voice coils in parallel I was getting port speeds over the 15m/s maximum that they recommend. Is that right?
Sorry so long. But this is interesting stuff and I'd like to learn more about it.
[Edited last by Ryan Schnacke on October 30, 2001 at 02:14 PM]